American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 235
which will be referred to subsequently, and,for the present, the effect may be overlooked. The method just described. Fig. 160, has been chosen to illustrate thetheory of the combination on one wire, of increase and decrease of current and re-versals of polarity, because of its simplicity, but, in… … ■>!!!!i^|i|ili!i^/ resents a transmitter; pc a pole-changer and nr and pr (as in Fig. 160), a Morse, orStearns relay, and polarized relay, respectively. In this arrangement the decrease of current is obtained by cutting off a largeportion of a battery b, when the transmitter is open, as in the…
Telegraph
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